Weather on May 21
Saint Louis, MO
55 Years of Data
Avg High
78°F
Avg Low
57°F
Warmest
1972
80°F avg
Coldest
2002
53°F avg
About This Date
May 21st in Saint Louis, MO typically brings pleasant spring weather, with average highs around 78°F and lows near 57°F. Over 53 years of records, the warmest May 21st was in 1972 (80°F average), while the coldest was 2002 (53°F) — a 27°F range across recorded history. Rain or other precipitation has occurred on about 23% of May 21st dates historically, with the wettest May 21st recording 4.98" of rain. The last decade has been 2.5°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.5°F warmer on this date compared to 20-30 years ago.
Planning for May 21st in Saint Louis, MO? Great weather for outdoor activities.
Cooling Trend
0.6°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 73° | 57° | 65° | — | — |
| 2024 | 90° | 68° | 79° | 1.14" | — |
| 2023 | 79° | 47° | 63° | — | — |
| 2022 | 80° | 57° | 69° | 4.6" | — |
| 2021 | 86° | 66° | 76° | — | — |
| 2020 | 67° | 56° | 61° | 0.1" | — |
| 2019 | 73° | 49° | 61° | 4.98" | — |
| 2018 | 80° | 66° | 73° | — | — |
| 2017 | — | 60° | — | — | — |
| 2016 | 72° | 53° | 62° | — | — |
| 2015 | 65° | 47° | 56° | — | — |
| 2014 | 88° | 69° | 78° | — | — |
| 2013 | 82° | 63° | 72° | 3.4" | — |
| 2012 | 90° | 59° | 74° | 0.15" | — |
| 2011 | 81° | 65° | 73° | 0.1" | — |
| 2010 | 65° | 57° | 61° | 0.74" | — |
| 2009 | 81° | 53° | 67° | — | — |
| 2008 | 67° | 46° | 56° | — | — |
| 2007 | 82° | 52° | 67° | — | — |
| 2006 | 72° | 53° | 62° | — | — |
| 2005 | 67° | 52° | 59° | — | — |
| 2004 | 87° | 71° | 79° | — | — |
| 2003 | 70° | 53° | 61° | — | — |
| 2002coldest | 64° | 42° | 53° | — | — |
| 2001 | 78° | 59° | 69° | 1.12" | — |
| 2000 | 64° | 45° | 54° | — | — |
| 1999 | 78° | 58° | 68° | — | — |
| 1998 | 85° | 71° | 78° | — | — |
| 1997 | 69° | 46° | 58° | — | — |
| 1996 | 88° | 59° | 73° | 0.15" | — |
| 1995 | 76° | 58° | 67° | 2.03" | — |
| 1994 | 80° | 54° | 67° | — | — |
| 1993 | 71° | 41° | 56° | — | — |
| 1992 | 81° | 66° | 73° | — | — |
| 1991 | 82° | 67° | 74° | — | — |
| 1990 | 72° | 52° | 62° | — | — |
| 1989 | 78° | 60° | 69° | — | — |
| 1988 | 89° | 60° | 75° | — | — |
| 1987 | 88° | 60° | 74° | — | — |
| 1986 | 72° | 51° | 61° | — | — |
| 1985 | 77° | 58° | 67° | 0.05" | — |
| 1984 | 84° | 65° | 74° | — | — |
| 1981 | 72° | 45° | 58° | — | — |
| 1980 | 77° | 57° | 67° | — | — |
| 1979 | 73° | 55° | 64° | — | — |
| 1978 | 81° | 55° | 68° | — | — |
| 1977 | 89° | 60° | 75° | — | — |
| 1976 | 83° | 56° | 69° | — | — |
| 1975 | 89° | 61° | 75° | — | — |
| 1974 | 90° | 68° | 79° | — | — |
| 1973 | 77° | 55° | 66° | — | — |
| 1972warmest | 92° | 68° | 80° | — | — |
| 1971 | 76° | 46° | 61° | — | — |
53 years of data from ST LOUIS ST LOUIS UNIV